WO8904201-A1  Chemical Abstracts, vo. 91, no. 6, 6 August 1979, (Columbus, Ohio, US) B.J. Narola et al.: "Cellulose acetate (CA)-poly(methylmethacrylate)(PMMA) blend semipermeable membrane. Part IV. Application of CA_PMMA blend flat membrane for other than brackish water desalination", see page 47, abstract no. 40544r & Indian Chem. J., 1979, 13 (11), 23 - 24;  Chemical Abstracts, vo. 91, no. 6, 6 August 1979, (Columbus, Ohio, US) B.J. Narola et al.: &quot;Cellulose acetate (CA)-poly(methylmethacrylate)(PMMA) blend semipermeable membrane. Part IV. Application of CA_PMMA blend flat membrane for other than brackish water desalination&quot;, see page 47, abstract no. 40544r &amp; Indian Chem. J., 1979, 13 (11), 23 - 24;  Chemical Abstracts, vol. 90, no. 20, 14 May 1979, (Columbus, Ohio, US) B.J. Narola et al.: "Cellulose acetate (CA).poly(methylmethacrylate)(PMMA) semipermeable membrane: Part I: Development of CA PMMA blend flat semi-permeable membrane", see page 36, abstract no. 153132c & Indian Chem. J., 1978, 13 (6), 29 - 31;  Chemical Abstracts, vol. 90, no. 20, 14 May 1979, (Columbus, Ohio, US) B.J. Narola et al.: &quot;Cellulose acetate (CA).poly(methylmethacrylate)(PMMA) semipermeable membrane: Part I: Development of CA PMMA blend flat semi-permeable membrane&quot;, see page 36, abstract no. 153132c &amp; Indian Chem. J., 1978, 13 (6), 29 - 31;  See also references of EP 0354937A1WO8904201-A  Chemical Abstracts, vo. 91, no. 6, 6 August 1979, (Columbus, Ohio, US) B.J. Narola et al.: &quot;Cellulose acetate (CA)-poly(methylmethacrylate)(PMMA) blend semipermeable membrane. Part IV. Application of CA_PMMA blend flat membrane for other than brackish water desalination&quot;, see page 47, abstract no. 40544r &amp; Indian Chem. J., 1979, 13 (11), 23 - 24;  Chemical Abstracts, vol. 90, no. 20, 14 May 1979, (Columbus, Ohio, US) B.J. Narola et al.: &quot;Cellulose acetate (CA).poly(methylmethacrylate)(PMMA) semipermeable membrane: Part I: Development of CA PMMA blend flat semi-permeable membrane&quot;, see page 36, abstract no. 153132c &amp; Indian Chem. J., 1978, 13 (6), 29 - 31;  Chemical Abstracts, vo. 91, no. 6, 6 August 1979, (Columbus, Ohio, US) B.J. Narola et al.: "Cellulose acetate (CA)-poly(methylmethacrylate)(PMMA) blend semipermeable membrane. Part IV. Application of CA_PMMA blend flat membrane for other than brackish water desalination", see page 47;  Chemical Abstracts, vol. 90, no. 20, 14 May 1979, (Columbus, Ohio, US) B.J. Narola et al.: "Cellulose acetate (CA).poly(methylmethacrylate)(PMMA) semipermeable membrane: Part I: Development of CA PMMA blend flat semi-permeable membrane", see page 36;  See also references of EP 0354937A1